Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean
The apparently obligate symbiosis between the diazotroph Candidatus Atelocyanobacterium thalassa (UCYN-A) and its haptophyte host, Braarudosphaera bigelowii, has recently been found to fix dinitrogen (N2) in polar waters at rates (per cell) comparable to those observed in the tropical/subtropical ol...
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| Format: | Article |
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Frontiers Media S.A.
2022-09-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2022.877562/full |
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| author | Corday R. Selden Sveinn V. Einarsson Kate E. Lowry Kate E. Lowry Katherine E. Crider Robert S. Pickart Peigen Lin Carin J. Ashjian P. Dreux Chappell |
| author_facet | Corday R. Selden Sveinn V. Einarsson Kate E. Lowry Kate E. Lowry Katherine E. Crider Robert S. Pickart Peigen Lin Carin J. Ashjian P. Dreux Chappell |
| author_sort | Corday R. Selden |
| collection | DOAJ |
| description | The apparently obligate symbiosis between the diazotroph Candidatus Atelocyanobacterium thalassa (UCYN-A) and its haptophyte host, Braarudosphaera bigelowii, has recently been found to fix dinitrogen (N2) in polar waters at rates (per cell) comparable to those observed in the tropical/subtropical oligotrophic ocean basins. This study presents the novel observation that this symbiosis increased in abundance during a wind-driven upwelling event along the Alaskan Beaufort shelfbreak. As upwelling relaxed, the relative abundance of B. bigelowii among eukaryotic phytoplankton increased most significantly in waters over the upper slope. As the host’s nitrogen demands are believed to be supplied primarily by UCYN-A, this response suggests that upwelling may enhance N2 fixation as displaced coastal waters are advected offshore, potentially extending the duration of upwelling-induced phytoplankton blooms. Given that such events are projected to increase in intensity and number with ocean warming, upwelling-driven N2 fixation as a feedback on climate merits investigation. |
| first_indexed | 2024-04-11T21:15:16Z |
| format | Article |
| id | doaj.art-d3520cedea6944e486d0d77bcaa64914 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-11T21:15:16Z |
| publishDate | 2022-09-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-d3520cedea6944e486d0d77bcaa649142022-12-22T04:02:51ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452022-09-01910.3389/fmars.2022.877562877562Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic OceanCorday R. Selden0Sveinn V. Einarsson1Kate E. Lowry2Kate E. Lowry3Katherine E. Crider4Robert S. Pickart5Peigen Lin6Carin J. Ashjian7P. Dreux Chappell8Department of Ocean and Earth Sciences, Old Dominion University, Norfolk, VA, United StatesDepartment of Ocean and Earth Sciences, Old Dominion University, Norfolk, VA, United StatesScience Philanthropy Alliance, Palo Alto, CA, United StatesWoods Hole Oceanographic Institution, Woods Hole, MA, United StatesDepartment of Ocean and Earth Sciences, Old Dominion University, Norfolk, VA, United StatesWoods Hole Oceanographic Institution, Woods Hole, MA, United StatesWoods Hole Oceanographic Institution, Woods Hole, MA, United StatesWoods Hole Oceanographic Institution, Woods Hole, MA, United StatesDepartment of Ocean and Earth Sciences, Old Dominion University, Norfolk, VA, United StatesThe apparently obligate symbiosis between the diazotroph Candidatus Atelocyanobacterium thalassa (UCYN-A) and its haptophyte host, Braarudosphaera bigelowii, has recently been found to fix dinitrogen (N2) in polar waters at rates (per cell) comparable to those observed in the tropical/subtropical oligotrophic ocean basins. This study presents the novel observation that this symbiosis increased in abundance during a wind-driven upwelling event along the Alaskan Beaufort shelfbreak. As upwelling relaxed, the relative abundance of B. bigelowii among eukaryotic phytoplankton increased most significantly in waters over the upper slope. As the host’s nitrogen demands are believed to be supplied primarily by UCYN-A, this response suggests that upwelling may enhance N2 fixation as displaced coastal waters are advected offshore, potentially extending the duration of upwelling-induced phytoplankton blooms. Given that such events are projected to increase in intensity and number with ocean warming, upwelling-driven N2 fixation as a feedback on climate merits investigation.https://www.frontiersin.org/articles/10.3389/fmars.2022.877562/fullN2 fixationdiazotrophUCYN-ABraarudosphaera bigelowiiArctic Oceanupwelling |
| spellingShingle | Corday R. Selden Sveinn V. Einarsson Kate E. Lowry Kate E. Lowry Katherine E. Crider Robert S. Pickart Peigen Lin Carin J. Ashjian P. Dreux Chappell Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean Frontiers in Marine Science N2 fixation diazotroph UCYN-A Braarudosphaera bigelowii Arctic Ocean upwelling |
| title | Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
| title_full | Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
| title_fullStr | Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
| title_full_unstemmed | Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
| title_short | Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
| title_sort | coastal upwelling enhances abundance of a symbiotic diazotroph ucyn a and its haptophyte host in the arctic ocean |
| topic | N2 fixation diazotroph UCYN-A Braarudosphaera bigelowii Arctic Ocean upwelling |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2022.877562/full |
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